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A scientist was studying reactions of metals and nonmetals. He knew group 1 and 2 elemetals. So, he chooses different elements from group 1, group 2 and group 17.
What is valency of magnesium?

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Magnesium is a group 2 element. Its valency is 2.
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Group 2 elements are

Group 2 elements belong to

The atomic size of elements of group 2 compared to group 1 element are